import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(
  title:'导航演示01',
  home: new FirstScreen()
));


class FirstScreen extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar:AppBar(
          title: Text('导航页面')
        ) ,
        body:Center (
          child: RaisedButton(
            child: Text("查看商品详情页"),
            onPressed:(){
              Navigator.push(context, MaterialPageRoute(
                builder: (context) => new SecondScreen()
              ));
            }
          ),
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget{
  @override
  Widget build(BuildContext context){
    return Scaffold(
      appBar:AppBar(title:Text('技术胖商品详情页')),
      body: Center(
        child:RaisedButton(
          child: Text('返回') ,
          onPressed: (){
            Navigator.pop(context);
          },
        ),
      ),
    );
  }
}